Collet index fixture



De 28, 1943- J. BocHENEK COLLET INDEX FIXTURE Filed April 8, 1942 INVENTOR JOSEPH BOCHENEK ATTORNEYS Patented Dec. 2S, 1943 UNITED STATES PATENT COLLET INDEX FIXTURE Joseph Boclienek, Milwaukee, Wis. Application April 8, 1942, Serial No. 438,063

3 Claims.

This invention appertains to a novel collet xture for effectively holding and indexing stock while being worked upon by a milling, shaping, grinding, or like machine.

One of the primary objects of my invention is to provide a collet'index fixture in which the Work can be readily turned and quickly held in a selected position relative to the operating tool.

Another salient object of my invention is to provide a collet index xture which merely embodies a base plate having a right-angularly extending wall or ange for rotatably supporting a hollow work-receiving shaft or spindle, with an adjustable collar at one end for gripping the work, and a dial index plate at its opposite end, and a sliding index pin or plunger movable through the wall or iiange into a selected index opening in the dial plate for holding the spindle and work in a selected position.

A further important object of my invention is the provision of means whereby the dial plate and spindle can be accurately adjusted and locked relative to one another, whereby the work and spindle can be slightly turned relative to the set dial plate to facilitate certain operations or to correct slight errors in setting, which might occur.

A still further object of my invention is the provision of a rotatable spindle for receiving and gripping the work, having a lock collar on one end thereof for rotation therewith, and a dial index plate on the spindle adjustably connected with the collar, whereby the collar and spindle can be turned, within certain limits, relative tov the dial plate, said adjustable connection permitting the collar and dial plate to be firmly bound together for synchronous movement.

With these and other objects in View, the invention consists in the novel construction, arrangement, and formation of parts, as will be hereinafter more speciiically described, claimed, and illustrated in the accompanying drawing, in which drawing:

Figure 1 is a top plan view of my novel collet index xture, showing the same used for holding a bar of solid stock in position relative to the tool of a milling machine, parts of the figure being shown broken away and in section to illustrate structural details.

Figure 2 is a central, longitudinal, sectional view through the fixture, taken on the line 2-2 of Figure 4, looking in the direction of the arrows.

Figure 3 is a sectional View through the workholding collet, taken on the line 3-3 of Figure 2, looking in direction of the arrows.

Figure 4 is a front elevational View of my novel collet index fixture.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter F generally indicates my novel collet index xture. The fixture F is of a universal character and can be disposed in a horizontal or vertical position upon the bed or table of a metalworking machine.

The xture can be used with milling machines, grinders, Shapers, drill presses, and the like, and can be held in a vise, a magnetic chuck, or bolted to the table of any machine, and can be used for many different purposes.

In the present instance, I have shown a collet index xture of the type for permitting the work to extend therethrough. The work is indicated by the reference character W and is being operated upon' by the tool '5 of a milling machine M for making a hexagonal bar.

As illustrated, the novel collet index fixture F includes a base plate lil having formed on one edge thereof a right-angularly extending wall or iiange II. This wall or flange II has formed thereon an enlargement l2, which forms a bearing for rotatably receiving the hollow spindle I3. The spindle I3 extends entirely through the wall II and the bearing I2 and projects outwardly from the opposite sides of said wall. One end of the spindle i3 has formed thereon an enlarged hollow head Ill, having a tapered inner face I5 for receiving the split collect clamping ring I6. The outer surface of the split collet clamping ring IS is tapered and is fitted within the hollow head Iii. A collar Il is threaded upon said head and is provided with an inturned annular flange I8 for engaging the split clamping ring to force the same into said head for contraction about the work W. Hence, the work can be iirmly and tightly clamped in said spindle and centered relative thereto. The outer face of the collar Il can be provided at spaced points with openings for the reception of a suitable handle or lever, whereby the collar can be turned.

Pfotatably mounted upon the opposite end of the spindle is a dial index plate Il. Threaded upon the spindle adjacent the dial plate is a lock collar 20, and this collar can be firmly secured to said spindle by means of a machine screw 2l. Rgidly connected to the collar 20 is an adjustment plate 22. This plate 22 can be riveted or otherwise connected to the lock collar 20 by fastening elements 23. The adjustment plate 22 is relatively thin and has formed thereon a radially extending ear 24. This ear is provided with an arcuate slot 25, which is concentric with the axis of the spindle. The index dial plate I9 carries a set screw 2S, which extends through the slot 25, and by tightening or loosening this screw, the dial plate and the spindle can be turned relative to one another to a limited degree. By this construction, it is obvious that the dial plate i can be accurately set on the spindle.

The dial plate is provided. with an annular row of spaced openings 21, any one of which is adapted to be brought into registration with an opening 28 formed in the wall Il. A headed plunger or pin 29 is employed for movement through the opening 28 and into one selected opening 2l. By this arrangement, the dial plate and the spindle and the work can be turned to a selected position and held against movement` Any predetermined number` of openings Z7 are provided, and in the present instance, the index plate is shown with twelve holes or openings to give two, three, four, six, eight, or twelve divisions, or 30 spacings.

As stated, the set screw employed for connecting the dial index plate with the lock collar can be, loosened to permit inaccuracies to be taken care of.

From the foregoing description it can be seen that I have provided an exceptionally simple and durable collet index xture, which will effectively perform its work.

Changes in details may be made, which do not depart from the spirit and scope of my claims, and what I claim as new is:

1.V A collet index xture comprising, a base plate, a right-angularly extending wall formed on the base plate having a bearing boss, a spindle rotatable in the bearing boss and extending beyond both sides of the wall, a collet for the work carried by and rotatable with one end vof the spindle, a dial index plate mounted on the other end of the spindle, a lock collar on said spindle for Vholding the spindle against shifting movement in the bearing boss, means connecting the dial plate with the lock collar, the index plate having a plurality of spaced openings therein, and said wall having an opening therein, and a slidable index pin mounted in the opening in the wall for movement into and out of selected openings in the dial index plate for holding the spindle and collet in a desired position, said means for holding the dial index plate to the lock collar being adjustable, whereby the lock collar and spindle can be turned within certain limits relative to said dial index plate.

2. A collet index fixture comprising, a body, a spindle rotatable on the body, a collet for the Work carried by and rotatable with the spindle,

.an index plate carried by and movable on the spindle, means detachably locking the index plate in differentV selected positions on the body, a lock collar rigidly connected with the spindle and tted against said index plate, a radially extending ear carried by the lock collar having an arcuate slot ooncentrically arranged relative to the axis of the spindle, and an adjustable set screw extending through the slot in the ear and into said index plate.

3. A collet index fixture comprising, a base plate, a right-angularly extending wall formed on the base plate, a bearing boss on said wall, a hollow spindle rotatably mounted in said boss and extending beyond the opposite sides of said Wall, a collet for the Work carried by and rotatable with one end of the spindle, an index plate rotatably mounted on the spindle and tted against one face of said wall, a lock collar for holding the spindle against longitudinal shifting movement in the bearing boss secured to the spindle and against said index plate, means detachably securing the index plate to the wall, a-

radially extending ear rigidly connected with` the collar, said ear having an arcuate slot concentrically arranged relative to the axis of the spindle, and a set screw extending through said slot and into said dial plate for adjustably connecting the collar and spindle to said dial plate.

JOSEPH BOCHENEK. 

